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Modular Trough Power Plants Cycle and System Analysis 1. Objective The objective of this analysis is to reduce the cost of power production from modular concentrating solar power plants through a relatively new and exciting concept that merges two mature technologies to produce distributed modular electric power in the range of 500 to 1,500 kWe. These are the organic Rankine cycle (ORC) power plant and the concentrating solar parabolic (CSP) trough technologies that have been developed independent of each other over many years. Parabolic trough collector technology has been used in large central-station power plants such as the Solar Electric Generating Systems (SEGS) power plants in the California Mojave Desert, which consists of 354 Megawatts (MWe) of installed electric generating capacity. These have been in operation for up to 16 years. ORC air-cooled modular power units have been successfully applied for large- and small-scale geothermal power plants, with more than 600 MWe of capacity, during the same period. The merging of these two technologies to produce distributed modular power plants in the range of 500 to 1500 kilowatt (kWe) offers a new application for both technologies. It is our objective in this report to introduce a modular trough power plant (MTPP) and discuss its performance and the cost of electricity generation from such system. 2. Introduction Several factors are creating an increased market potential for small trough power technology. These include the need for distributed power systems for rural communities worldwide, the need to generate more electricity by non-combustion renewable processes, the need for sustainable power for economic growth in developing countries, and the deregulation and privatization of the electrical generation sector worldwide. Parabolic trough technology has proven to be a very mature solar technology for large-scale power generation. The nine SEGS parabolic trough power plants in the California Mojave Desert consists of 354 MWe of installed electric generating capacity that have been in operation for up to 16 years. The SEGS plants use steam Rankine cycle power plants. Economic optimization of steam power systems for bulk power applications tends to drive plants to larger and larger sizes. Unfortunately, low energy prices in recent years have slowed the continued development of large-scale trough power plants for bulk power markets. Higher value market opportunities for trough solar power plants include smaller distributed generation and remote power applications. Distributed generation has higher value than centralized power generation because it can eliminate power losses in the transmission and distribution (T&D) system, improve system reliability, and occasionally offset the need for upgrades to the T&D system. Distributed generation located at a customer site often offsets energy costs at the customer’s retail price rather than the utility’s price for bulk generation. Remote power applications are typically of high value because of high fuel prices and low conversion efficiencies. Diesel generators or photovoltaics are often the competition for remote power applications. In addition, a number of green power markets are developing where customers either choose or are obligated to purchase renewable electric power. Unfortunately, the green power market has not matured to the point where it will support the development of large solar power plants. This 1PDF Image | Modular Trough Power Plant Cycle and Systems Analysis
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